| Proposal ID | 088422 |
| Title | Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0884220201 |
| DOI | https://doi.org/10.57780/esa-48o6130 |
| Principal Investigator, PI | Dr Dominic Walton |
| Abstract | Following a series of remarkable discoveries, we now know that some of the mostluminous ULXs are actually powered by highly super-Eddington pulsars (i.e.neutron stars), making them the most extreme accretors known. A number of theknown ULX pulsars exhibit unusual off-states in which their X-ray flux dropsby ~2 orders of magnitude (or more). These off-states are fairly rare, butrecent monitoring with Swift shows that NGC5907 ULX1, the most extreme of theULX pulsars with L(X,peak)~1e41 erg/s, is now entering one. Here we proposethree 60ks observations of NGC5907 ULX1 (180ks in total) designed to continueour efforts to determine the nature of these events. This is of criticalimportance, as these off-states may offer a means to determine the B-fields of these systems. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2021-02-20T01:32:22Z/2021-03-05T13:58:37Z |
| Version | 19.16_20210326_1200 |
| Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2022-07-15T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "super eddington pulsars", "neutron stars", "luminous ulxs", "1e41 erg", "ngc5907 ulx1", "ngc5907 ulx1 180", "ulx pulsars exhibit", "NGC5907", "total designed", "ngc5907 ulx", "fairly rare", "ulx pulsars", "actually powered", "xray flux drops" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Dominic Walton, 2022, 'Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX', 19.16_20210326_1200, European Space Agency, https://doi.org/10.57780/esa-48o6130 |